The following line of code compiles just fine on OS X (and presumably linux): Block *b = new (fallible_t()) Block(); On windows, however, try server is giving me this error: <filename> : error C2066: cast to function type is illegal <filename> : error C2440: 'initializing' : cannot convert from 'mozilla::fallible_t (__cdecl **)(void)' to 'EdgePool::Block *' Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast Not sure what to do here, but it looks like all |new| on windows is infallible at the moment.

Does this differ from bug 613766?

Oops, looks like I accidentally double-filed.